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Finding the Fourth Proportional to 116.63, 174.71 and 90.81

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Solution

The fourth proportional to 116.63, 174.71 and 90.81 is: 136.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    116.63 : 174.71 = 90.81 : x
  2. Step 2: Convert to fraction form
    116.63/174.71 = 90.81/x
  3. Step 3: Cross multiply
    116.63x = 174.71 × 90.81
  4. Step 4: Simplify right side
    116.63x = 15,864.96
  5. Step 5: Solve for x
    x = 15,864.96/116.63
  6. Step 6: Final answer
    x = 136.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.